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Plants 2016, 5(2), 26; doi:10.3390/plants5020026

Potential Pasture Nitrogen Concentrations and Uptake from Autumn or Spring Applied Cow Urine and DCD under Field Conditions

Soil Science Department, Lincoln University, Christchurch, Lincoln 7647, New Zealand
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Academic Editor: Maurizio Chiurazzi
Received: 8 April 2016 / Revised: 31 May 2016 / Accepted: 6 June 2016 / Published: 13 June 2016
(This article belongs to the Special Issue Plant Nitrogen Metabolism)
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Abstract

Nitrogen (N) cycling and losses in grazed grassland are strongly driven by urine N deposition by grazing ruminants. The objective of this study was to quantify pasture N concentrations, yield and N uptake following autumn and spring deposition of cow urine and the effects of fine particle suspension (FPS) dicyandiamide (DCD). A field plot study was conducted on the Lincoln University dairy farm, Canterbury, New Zealand from May 2003 to May 2005. FPS DCD was applied to grazed pasture plots at 10 kg·ha−1 in autumn and spring in addition to applied cow urine at a N loading rate of 1000 kg·N·ha−1, with non-urine control plots. Pasture N ranged between 1.9 and 4.8% with higher concentrations from urine. Results indicated that urine consistently increased N concentrations for around 220 days post deposition (mid December/early summer) at which point concentrations dropped to background levels. In urine patches, pasture yield and annual N uptake were dramatically increased on average by 51% for autumn and 28% for spring applied urine, in both years, when DCD was applied. This field experiment provides strong evidence that annual pasture N uptake is more strongly influenced by high urine N deposition than pasture N concentrations. FPS DCD has the potential to result in very high N uptake in urine patches, even when they are autumn deposited. View Full-Text
Keywords: plant nitrogen; soil nitrogen; nitrification inhibitor; dicyandiamide (DCD); grazed pasture; urine; dairy plant nitrogen; soil nitrogen; nitrification inhibitor; dicyandiamide (DCD); grazed pasture; urine; dairy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Moir, J.; Cameron, K.; Di, H. Potential Pasture Nitrogen Concentrations and Uptake from Autumn or Spring Applied Cow Urine and DCD under Field Conditions. Plants 2016, 5, 26.

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